Continuous production device for chemical fiber titanium dioxide slurry

Abstract

The utility model relates to the technical field of chemical fiber titanium dioxide production devices, and discloses a continuous production device for chemical fiber titanium dioxide slurry, which comprises a primary slurry refining and dispersing group, a slurry adjusting group, a coating group and a slurry washing group which are communicated in sequence, and the primary slurry refining and dispersing group comprises a grinding part and a hydrocyclone separation part communicated with the grinding part; the slurry adjusting group comprises a preheating part communicated with the suspension separation part and a slurry adjusting part communicated with the preheating part, the coating group comprises a plurality of coating units connected in series, each coating unit comprises a static mixing part and a precipitation part communicated with the static mixing part, and the slurry washing group comprises a washing part communicated with the precipitation part and a solid-liquid separation part communicated with the washing part; the device can continuously produce titanium dioxide, the particle size of the produced titanium dioxide is uniform, a coating layer is of a layer-by-layer coating structure, the hydrocyclone separation part and the static mixing part used in the device work by adopting gravity, the energy consumption of the device is low, and the titanium dioxide with the uniform particle size can be obtained according to requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical fiber titanium dioxide production devices, in particular to a chemical fiber titanium dioxide slurry continuous production device. Background Art

[0002] Titanium dioxide is a white pigment with stable structure, high whiteness, high refractive index and strong hiding power. It is widely used in coatings, rubber, papermaking, chemical fiber, food and other fields. The surface of untreated titanium dioxide carries polar groups such as hydroxyl groups, which makes it easy to agglomerate in organic polyester and has poor dispersion. Therefore, the surface of titanium dioxide needs to be coated before application. Currently, the commonly used coating treatment is inorganic coating method, such as silicon coating method and silicon-aluminum coating method.

[0003] At present, the device used in the inorganic coating method is a titanium dioxide inorganic coating device. The traditional titanium dioxide inorganic coating device is mainly an intermittent device, such as a reactor for surface coating of ultrafine titanium dioxide disclosed in publication number CN982081057. This type of device uses a single coating container, the equipment production capacity is low, and the coating slurry dispersion of this type of inorganic coating device is low, the titanium dioxide particle coating uniformity is low, and the product quality is low; in order to be able to solve the problems existing in the above-mentioned intermittent inorganic coating device, personnel in this field have disclosed a continuous titanium dioxide coating device, such as a titanium dioxide continuous inorganic coating device disclosed in publication number CN214514247U, the device consists of a first slurry storage tank, a first premixing tank, a second premixing tank and a second slurry storage tank connected in sequence by pipelines, and the device can realize continuous production of the entire process of titanium dioxide; but the insulation pipeline of the device is placed after the two premixing tanks, so the device can only be used for mixed coating, and cannot realize the layer-by-layer coating process of titanium dioxide. Summary of the invention

[0004] In order to overcome the problems in the prior art, the utility model provides a continuous production device for chemical fiber titanium dioxide slurry, which consists of a raw slurry refining and dispersion group, a slurry adjustment group, a first coating group, a second coating group and a slurry washing group. The raw slurry refining and dispersion group includes a suspension separation section, the first coating group includes a first static mixing section and a first aging section, and the second coating group includes a second static mixer and a second aging section. The device can continuously produce titanium dioxide, and the titanium dioxide produced has uniform particle size. The coating layer is a layer-by-layer coating structure. The device has low energy consumption and can obtain titanium dioxide with uniform particle size according to demand.

[0005] The specific technical solution of this invention is:

[0006] A continuous production device for chemical fiber titanium dioxide slurry, comprising a raw slurry refining and dispersing group, a slurry adjustment group, a coating group and a slurry washing group which are connected in sequence;

[0007] The raw pulp refining and dispersing group comprises a grinding part and a hydrocyclone separation part connected to the grinding part;

[0008] The slurry adjustment group includes a preheating part connected to the suspension separation part and a slurry adjustment part connected to the preheating part;

[0009] The coating group includes a plurality of coating units connected in series, and the coating unit includes a static mixing part and a settling part connected to the static mixing part;

[0010] The slurry washing group includes a washing part connected to the settling part and a solid-liquid separation part connected to the washing part.

[0011] The utility model provides a chemical fiber titanium dioxide slurry continuous production device, the device is composed of a raw slurry refining and dispersing group, a slurry adjusting group, a coating group and a washing group. The raw slurry refining and dispersing group includes a grinding part and a hydrocyclone separation part. The crude titanium dioxide product is ground and refined by the grinding part, and then the refined crude titanium dioxide product is sorted by the hydrocyclone separation part. Large particles of titanium dioxide continue to flow back to the grinding part to continue to be ground and refined with the crude titanium dioxide product, and the particle size of titanium dioxide particles in the sorted titanium dioxide slurry is more uniform; the slurry adjusting group includes a preheating part and a slurry adjusting part. The titanium dioxide slurry needs to be preheated to a coating temperature in the preheating part before coating, and the slurry concentration of the titanium dioxide is adjusted to a suitable coating concentration in the slurry adjusting part. The coating group includes several coating units connected in series, each of which includes a static mixing section and a settling section. Each coating unit can coat the particles in the titanium dioxide slurry once individually. Therefore, by connecting multiple coating units in series, the layer-by-layer coating of the titanium dioxide particles is completed, and the titanium dioxide slurry can be coated layer by layer with different materials. The static mixing section can fully mix the titanium dioxide slurry, the neutralizer and the coating agent, and the titanium dioxide particles in the mixed slurry separated from the tail of the static mixing section will not settle, but will all enter the settling section for coating. The slurry washing group includes a washing section and a solid-liquid separation section. The coated titanium dioxide is washed by the washing section to remove the salt, and then the titanium dioxide slurry is subjected to solid-liquid separation by the solid-liquid separation section.

[0012] Preferably, the cyclone separation part comprises a shell and a cyclone located in the shell, the shell is provided with a reflux port located at the bottom of the shell and a diversion port located at the side surface of the shell, the inner wall of the cyclone is provided with a plurality of cyclone grooves, the outer wall of the cyclone is provided with a plurality of diversion grooves, and the diversion grooves connect the cyclone grooves and the diversion ports.

[0013] Preferably, the swirl groove is an arc-shaped groove, and the diversion groove is a vertical groove.

[0014] Preferably, the inner surface of the shell is provided with a collecting groove connected with the diverter groove.

[0015] Preferably, the inlet inner diameter of the cyclone is larger than the outlet inner diameter.

[0016] The hydrocyclone separation part of the utility model comprises a shell and a cyclone. The cyclone is provided with an arc-shaped cyclone groove and a diverter groove provided on the cyclone groove. The inlet inner diameter of the cyclone is larger than the outlet inner diameter, so that an inverted trapezoidal cavity is formed inside the cyclone. When the cyclone is used, the titanium dioxide slurry enters from the inlet of the cyclone and flows into the cyclone groove. Under the action of gravity, the slurry starts to move from the inner wall of the cyclone groove located at the opening of the cyclone and moves along the inner wall of the cyclone groove. The titanium dioxide slurry with a particle size larger than the width of the diverter groove is blocked outside the diverter groove and moves with the cyclone. The titanium dioxide slurry with a particle size smaller than the separation groove is blocked outside the diverter groove and moves with the cyclone. The titanium dioxide particle slurry with a flow channel width will enter the diverter channel, thereby realizing the sorting of titanium dioxide particles. After separating from the cyclone channel, the larger titanium dioxide particles enter the outlet at the bottom of the outer shell and flow back to the grinding part for further grinding. The cyclone channel of the utility model is an arc-shaped channel, and the diverter channel in the cyclone channel is a vertical channel. The slurry rotates in the arc-shaped cyclone channel. When the rotating slurry passes through the vertically arranged diverter channel, a dislocation shear effect is formed. The rotating slurry will impact some of the titanium dioxide particles stuck in the vertical channel, causing them to separate from the diverter channel, which can effectively prevent the problem of slurry blockage and improve the sorting efficiency.

[0017] Preferably, the slurry adjustment part is provided with a brine delivery pipeline and a density detection device, the brine delivery pipeline is provided with a first valve, and the density detection device is electrically connected to the first valve; the brine delivery pipeline of the utility model is provided with an electrically connected density detection device and a first valve, the density of the slurry in the pipeline is detected by the density detection device, and the density is adjusted in real time by the first invention to adjust the concentration of the slurry.

[0018] Preferably, the static mixing section is provided with a neutralizing agent input pipeline, a slurry input pipeline connected to the slurry adjustment section, a coating agent input pipeline and a slurry output pipeline.

[0019] Preferably, a second valve is provided on the neutralizer input pipeline, and a pH detection device is provided on the slurry output pipeline, and the pH detection device is electrically connected to the second valve; the pH detection device of the utility model can detect the pH of the slurry in the slurry pipeline, and control the second valve and the amount of neutralizer added in real time according to the pH.

[0020] Preferably, the washing section is provided with a washing brine injection pipe and a washing slurry output pipe connected to the solid-liquid separation section.

[0021] Preferably, a third valve is provided on the washing brine injection pipeline, and a conductivity detection device is provided on the washing slurry output pipeline, and the conductivity detection device is electrically connected to the third valve; the conductivity detection device of the utility model can detect the conductivity of the titanium dioxide slurry after washing, detect the salt content of the titanium dioxide slurry by conductivity, and control the switch of the third valve according to the conductivity.

[0022] Compared with the prior art, the utility model has the following technical effects:

[0023] The device provided by the utility model can continuously produce titanium dioxide, and the titanium dioxide produced has uniform particle size. The coating layer is a layer-by-layer coating structure. The cyclone separation part and the static mixing part used in the device work by gravity and do not require any function. The device has low energy consumption and can obtain titanium dioxide with uniform particle size according to demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a continuous production device for chemical fiber titanium dioxide slurry of the utility model.

[0025] Figure 2 It is a cross-sectional view of the hydrocyclone separation part of the utility model.

[0026] Figure 3 It is a structural schematic diagram of the cyclone of the utility model.

[0027] Figure 4 The HRTEM images of titanium dioxide powder of Example 1 and Comparative Example 1 of the present invention are shown in FIG. 1 , wherein (1) is the HRTEM image of titanium dioxide powder of Example 1, and (2) is the HRTEM image of titanium dioxide powder of Comparative Example 1.

[0028] In the figure, there are the raw pulp refining and dispersing group 1, the grinding section 101, the hydrocyclone separation section 102, the shell 121, the cyclone 122, the reflux port 123, the diversion port 124, the cyclone trough 125, the diversion trough 126, the collecting trough 127, the slurry adjustment group 2, the preheating section 201, the slurry adjustment section 202, the coating group 3, the static mixing section 301, the sedimentation section 302, the slurry washing group 4, the washing section 401 and the solid-liquid separation section 402. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the embodiments.

[0030] Embodiment 1:

[0031] like Figure 1As shown, a chemical fiber titanium dioxide slurry continuous production device comprises a raw slurry refining and dispersing group 1, a slurry adjusting group 2, a coating group 3 and a slurry washing group 4 which are connected in sequence; the raw slurry refining and dispersing group comprises a raw slurry tank, a delivery pump on the raw slurry tank, a grinding part 101 connected to the delivery pump and a hydrocyclone separation part 102 connected to the grinding part; the slurry adjusting group comprises a preheating part 201 connected to the suspension separation part and a slurry adjusting part 202 connected to the preheating part, a brine delivery pipeline and a density detector are provided on the slurry adjusting part, a first valve electrically connected to the density detector is provided on the brine delivery pipeline, the preheating part is a coil heat exchanger, and the slurry adjusting part is a slurry tank with a length-to-diameter ratio of 2:1 with top inlet and bottom outlet;

[0032] The coating group is two coating units connected in series, and the coating unit includes a static mixing section 301 and a settling section 302 connected to the static mixing section. The static mixing section is a static mixer, and is provided with a neutralizer input pipeline, a slurry input pipeline connected to the slurry adjustment section, a coating agent input pipeline and a slurry output pipeline. The slurry output pipeline is provided with a pH detector, and the neutralizer input pipeline is provided with a second valve electrically connected to the pH detector; the settling section is a settling tank with a length-to-diameter ratio of 15:1, with a hot water jacket provided on the outside of the settling tank, and an orifice plate internal part provided inside the settling tank;

[0033] The slurry washing group includes a washing section 401 connected to the coating group and a solid-liquid separation section 402 connected to the washing section. The washing section is a washing tank with an aspect ratio of 2:1 and a top-in and bottom-out. The solid-liquid separation section is a plate-frame filter press. The washing tank is provided with a washing brine injection pipeline and a washing slurry output pipeline connected to the solid-liquid separation section. The washing slurry output pipeline is provided with a conductivity detector. The washing brine injection pipeline is provided with a third valve electrically connected to the conductivity detector.

[0034] like Figure 2 and Figure 3 As shown, the suspension separation part includes a shell 121 and a cyclone 122 located in the shell, the shell is sleeved on the outside of the cyclone, a sprayer connected to the delivery pump is provided on the top of the shell, a reflux port is provided on the bottom of the shell, a plurality of diversion ports 124 and a collecting slot located below the diversion port are provided on the side wall of the shell, the collecting slot is sleeved on the outside of the shell, a collecting slot opening is provided at one end of the collecting slot, and the collecting slot opening is connected to the preheating part; the cyclone is an inverted trapezoidal shape, an inverted trapezoidal cavity is provided in the cyclone, the inlet diameter of the cyclone is larger than the outlet diameter, a plurality of cyclone slots arranged circumferentially along the inner wall of the cyclone are provided on the inner wall of the cyclone, the cyclone slots are arc-shaped slots, and the arc-shaped slots form a spiral on the inner wall of the cyclone, a diversion slot is provided on the outer wall of the cyclone, and the diversion slot is a vertical slot parallel to the center axis of the cyclone slot, and a support end is provided at the top and bottom of the cyclone, and the support end is clamped on the inner wall of the shell;

[0035] The dynamic process of the above-mentioned chemical fiber titanium dioxide slurry continuous production device is as follows: first, the titanium dioxide slurry required for grinding is adjusted into titanium dioxide slurry in the raw pulp tank, the titanium dioxide slurry enters the delivery pump through the pipeline, the delivery pump injects the titanium dioxide slurry into the grinding part for grinding, the ground titanium dioxide slurry enters the sprayer of the suspension separation part through the pipeline, the sprayer sprays the titanium dioxide slurry to the inlet of the cyclone, the titanium dioxide slurry enters the cyclone tank, the large particles of titanium dioxide flow along the cyclone tank with part of the liquid to the bottom of the cyclone and enter the suspension separation The titanium dioxide slurry flows out of the opening of the collecting tank and enters the preheating part through the pipeline. The preheating part heats the titanium dioxide slurry to a predetermined temperature and then enters the slurry adjustment tank through the pipeline. The slurry concentration of the titanium dioxide slurry is adjusted in the slurry adjustment part. The concentration of titanium dioxide slurry in the slurry adjustment part is adjusted in real time through the first valve on the brine delivery pipeline and the density detector in the slurry tank. Then the titanium dioxide slurry enters the static mixer through the slurry input pipeline, and the neutralizer enters the static mixer through the neutralizer input pipeline, and the coating agent enters the static mixer through the coating agent input pipeline. After the three raw materials are mixed in the static mixer, they flow into the slurry output pipeline from the tail end of the static mixer. The pH detector on the slurry output pipeline is connected to the second valve on the neutralizer pipeline. Electrically connected, and the amount of neutralizer added is controlled in real time according to the pH of the slurry output pipeline. The mixed slurry enters the sedimentation tank for sedimentation and coating process. After a predetermined time of sedimentation and coating, the surface of the titanium dioxide particles is coated with a coating layer. After the first layer of coating is completed, the slurry enters the second coating unit. In the second coating unit, it is coated again to form a second layer of coating. After the coating of the titanium dioxide particles is completed, it enters the washing section. The washed coated titanium dioxide enters the solid-liquid separation section through the washing slurry pipeline for solid-liquid separation.

[0036] Embodiment 2:

[0037] like Figure 1As shown, a chemical fiber titanium dioxide slurry continuous production device comprises a raw slurry refining and dispersing group 1, a slurry adjusting group 2, a coating group 3 and a slurry washing group 4 which are connected in sequence; the raw slurry refining and dispersing group comprises a raw slurry tank, a delivery pump on the raw slurry tank, a grinding part 101 connected to the delivery pump and a hydrocyclone separation part 102 connected to the grinding part; the slurry adjusting group comprises a preheating part 201 connected to the suspension separation part and a slurry adjusting part 202 connected to the preheating part, a brine delivery pipeline and a density detector are provided on the slurry adjusting part, a first valve electrically connected to the density detector is provided on the brine delivery pipeline, the preheating part is a coil heat exchanger, and the slurry adjusting part is a slurry tank with a length-to-diameter ratio of 4:3 with top inlet and bottom outlet;

[0038] The coating group is two coating units connected in series, and the coating unit includes a static mixing section 301 and a settling section 302 connected to the static mixing section. The static mixing section is a static mixer, and is provided with a neutralizer input pipeline, a slurry input pipeline connected to the slurry adjustment section, a coating agent input pipeline and a slurry output pipeline. The slurry output pipeline is provided with a pH detector, and the neutralizer input pipeline is provided with a second valve electrically connected to the pH detector; the settling section is a settling tank with a length-to-diameter ratio of 20:1, with a hot water jacket provided on the outside of the settling tank, and an orifice plate internal part provided inside the settling tank;

[0039] The slurry washing group includes a washing section 401 connected to the coating group and a solid-liquid separation section 402 connected to the washing section. The washing section is a washing tank with a length-to-diameter ratio of 4:3 and a top-in and bottom-out. The solid-liquid separation section is a plate-frame filter press. The washing tank is provided with a washing brine injection pipeline and a washing slurry output pipeline connected to the solid-liquid separation section. The washing slurry output pipeline is provided with a conductivity detector. The washing brine injection pipeline is provided with a third valve electrically connected to the conductivity detector.

[0040] like Figure 2 and Figure 3 As shown, the suspension separation part includes a shell 121 and a cyclone 122 located in the shell, the shell is sleeved on the outside of the cyclone, a sprayer connected to the delivery pump is provided on the top of the shell, a reflux port is provided on the bottom of the shell, a plurality of diversion ports 124 and a collecting slot located below the diversion port are provided on the side wall of the shell, the collecting slot is sleeved on the outside of the shell, a collecting slot opening is provided at one end of the collecting slot, and the collecting slot opening is connected to the preheating part; the cyclone is an inverted trapezoidal shape, an inverted trapezoidal cavity is provided in the cyclone, the inlet diameter of the cyclone is larger than the outlet diameter, a plurality of cyclone grooves arranged circumferentially along the inner wall of the cyclone are provided on the inner wall of the cyclone, the cyclone grooves are arc grooves, and the arc grooves form spirals on the inner wall of the cyclone, a diversion slot is provided on the outer wall of the cyclone, and the diversion slot is a vertical slot parallel to the central axis of the cyclone slot, and a support end is provided at the top and bottom of the cyclone, and the support end is clamped on the inner wall of the shell; the dynamic process of Example 2 is the same as the dynamic process of Example 1.

[0041] Comparative Example 1 (conventional coating)

[0042] The difference between Comparative Example 1 and Example 1 is that the titanium dioxide coating is carried out using the device with publication number CN214514247U.

[0043] Test example

[0044] The titanium dioxide obtained in Example 1 and Comparative Example 1 was tested by high-resolution transmission electron microscopy. Figure 4 As shown;

[0045] like Figure 4 As shown, (1) is a HRTEM image of a titanium dioxide powder with silicon-aluminum double-layer coating prepared by the chemical fiber titanium dioxide slurry continuous production device of Example 1 provided by the utility model, and (2) is a HRTEM image of a titanium dioxide powder with silicon-aluminum coating prepared by the conventional titanium dioxide continuous production device of Comparative Example 1. It can be seen from the figure that the coating layer of the titanium dioxide powder in Comparative Example 1 is a mixed layered structure, while the coating layer of the titanium dioxide powder in Example 1 is a two-layer structure, and the structures of the two layers are completely different. In addition, compared with Comparative Example 1, the particle size of the titanium dioxide in Example 1 is more uniform. When the uniform titanium dioxide particles are coated, the surface of the coating layer is smooth and the coating layer is more uniform. However, the layered structure of the coating layer of Comparative Example 1 is not uniform, and there is a protruding structure on the surface of the coating layer, and the quality of the titanium dioxide powder is relatively low.

Claims

1. A continuous production device for chemical fiber titanium dioxide slurry, characterized in that: It comprises a raw pulp refining and dispersing group (1), a pulp adjustment group (2), a coating group (3) and a pulp washing group (4) which are connected in sequence; The slurry refining and dispersing group comprises a grinding part (101) and a hydrocyclone separation part (102) connected to the grinding part; The slurry adjustment group comprises a preheating section (201) connected to the suspension separation section and a slurry adjustment section (202) connected to the preheating section; The coating group comprises a plurality of coating units connected in series, and the coating unit comprises a static mixing section (301) and a settling section (302) connected to the static mixing section; The slurry washing group comprises a washing section (401) connected to the settling section and a solid-liquid separation section (402) connected to the washing section.

2. The continuous production device for chemical fiber titanium dioxide slurry according to claim 1 is characterized in that: The hydrocyclone separation section comprises a shell (121) and a cyclone (122) located inside the shell, the shell being provided with a reflux port (123) located at the bottom of the shell and a diversion port (124) located at a side surface of the shell, a plurality of cyclone grooves (125) being provided on the inner wall of the cyclone, and a plurality of diversion grooves (126) being provided on the outer wall of the cyclone, the diversion grooves connecting the cyclone grooves and the diversion port.

3. The continuous production device for chemical fiber titanium dioxide slurry according to claim 2 is characterized in that: The swirl groove is an arc groove, and the diversion groove is a vertical groove.

4. The continuous production device for chemical fiber titanium dioxide slurry according to claim 2 is characterized in that: The inner surface of the shell is provided with a collecting groove (127) which is in communication with the diverting groove.

5. The continuous production device for chemical fiber titanium dioxide slurry according to claim 2 is characterized in that: The inlet inner diameter of the cyclone is larger than the outlet inner diameter.

6. The continuous production device of chemical fiber titanium dioxide slurry according to claim 1 is characterized in that: The slurry adjustment part is provided with a salt water delivery pipeline and a density detection device, the salt water delivery pipeline is provided with a first valve, and the density detection device is electrically connected to the first valve.

7. The continuous production device for chemical fiber titanium dioxide slurry according to claim 1 is characterized in that: The static mixing section is provided with a neutralizing agent input pipeline, a slurry input pipeline connected to the slurry adjustment section, a coating agent input pipeline and a slurry output pipeline.

8. The continuous production device for chemical fiber titanium dioxide slurry according to claim 7 is characterized in that: A second valve is provided on the neutralizer input pipeline, and a pH detection device is provided on the slurry output pipeline. The pH detection device is electrically connected to the second valve.

9. The continuous production device of chemical fiber titanium dioxide slurry according to claim 1 is characterized in that: The washing section is provided with a washing brine injection pipeline and a washing slurry output pipeline communicated with the solid-liquid separation section.

10. The continuous production device of chemical fiber titanium dioxide slurry according to claim 9 is characterized in that: The brine injection pipeline is provided with a third valve, and the washing slurry output pipeline is provided with a conductivity detection device, and the conductivity detection device is electrically connected to the third valve.

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